In urban areas, where there are large sections of the population that live in informal settlements or in poor quality housing, people do not have access to clean water and sanitation. Municipal authorities are unable to provide water and sanitation services to all and many access these informally and/or illegally. The lack of the basic services results in malnutrition and poor health, loss of life and livelihoods, and has devastating consequences on public health and environment. In this area of work, we seek to create information and knowledge about the inequalities of availability, access and quality of water and sanitation services, and the state of infrastructure. We work with communities and governments to draw attention to the problem, improve the delivery, and to make planning and practices pro poor.